Pressure Washer Electrical Part
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Pressure Washer Electrical Part

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Pressure Washer Electrical Part

Vacuum switches are installed on the inlet line to the pump. They are composed of two parts, the diaphragm, which responds to changes in system pressure, expanding toward its system side when pressure in the system falls below outside or atmospheric pressure, and the electrical switch which is held open by spring tension when there is no pressure differential and the diaphragm is in its normal position.
When the pump draws water into the system, the suction causes pressure on the inlet side of the pump to decrease, the diaphragm falls and the vacuum switch contacts close, completing the circuit to the burner system. When flow ceases, the diaphragm rises and a spring helps return the switch to the open position. With the switch open, the circuit to the burner system is broken, the solenoid valve closes, and fuel flow to the burner ceases, stopping burner firing.
NOTE: A potential problem with a vac switch can be created when the inlet filter or float tank becomes clogged. The pump will continue to run, creating a pressure drop on the inlet. When this happens, the vac switch will continue to close and start the burner.
This switch should be used on electric pressure washers with flow up to 3 GPM
Equivalent to 0001 vac switch

A High Temperature Limit Switch is used on hot water pressure washers to prevent excessive water temperature. The switch is a bi-metallic, non-adjustable thermostat. When the bi-metallic sensor expands and bends, it breaks an electrical circuit when the water reaches a pre-set temperature. When the switch cools, the metal contracts and the circuit is again completed.
The sensor consists of two strips of metal bonded together. The strips expand at different rates when the temperature increases. The differing expansion rate of the two metals allows the sensor to bend. Normally the bi-metallic sensor will touch another contact. The control circuit runs through this connection. As the temperature rises, the bi-metallic sensor bends away from the contact and the circuit is broken, cutting power to the fuel solenoid.
NOTE: The thermostat will not reset until all areas surrounding the part cool down. This may result in a temperature drop of up to 50 degrees before the thermostat resets and starts the burner.
25 amp

25 amp
A High Temperature Limit Switch is used on hot water pressure washers to prevent excessive water temperature. The switch is a bi-metallic, non-adjustable thermostat. When the bi-metallic sensor expands and bends, it breaks an electrical circuit when the water reaches a pre-set temperature. When the switch cools, the metal contracts and the circuit is again completed.
The sensor consists of two strips of metal bonded together. The strips expand at different rates when the temperature increases. The differing expansion rate of the two metals allows the sensor to bend. Normally the bi-metallic sensor will touch another contact. The control circuit runs through this connection. As the temperature rises, the bi-metallic sensor bends away from the contact and the circuit is broken, cutting power to the fuel solenoid.
Prewired with a 36" wire lead
NOTE: Thermostat will not reset until all components surrounding it have cooled swufficiently. This could result in up to a 50 degree temperature drop before the burner restarts.

Pressure Washer
The pressure switch responds to a rise or fall in system pressure by either breaking or completing an electrical circuit. The switch can be used several ways in the pressure washer system. It can be used as a fluid control device in conjuction with the trigger gun. When the gun valve closes, the increase in pressure throws the pressure switch and shuts off all power to the system. When the gun valve re-opens, pressure in the line is relieved , the switch closes, and power is restored to the system. When used as a boiler control, the switch is activated to complete a circuit to supply power to the burner assembly. When system pressure increases, the switch is activated to complete the circuit to the burner. When pressure falls the switch plunger returns to its normal position.
Activates at 580 PSI
3 Wire switch
15 amp
The electrical portion of the switch is wired with three leads. Two leads are used , depending upon whether the switch is intended to be normally on or normally off operation. When used as a fluid system control, the switch will generally be installed in the normally closed configuration. When used as a boiler control, the switch may be installed in the normally open position.

Responds to a rise or fall in system pressure by either breaking or completing an electrical circuit. Can be used as a fluid control device in conjunction with the trigger gun, or as a burner control to complete a circuit to the burner assembly.
15 amp

The pressure switch responds to a rise or fall in system pressure by either breaking or completing an electrical circuit. The switch can be used several ways in the pressure washer system. It can be used as a fluid control device in conjuction with the trigger gun. When the gun valve closes, the increase in pressure throws the pressure switch and shuts off all power to the system. When the gun valve re-opens, pressure in the line is relieved , the switch closes, and power is restored to the system. When used as a boiler control, the switch is activated to complete a circuit to supply power to the burner assembly. When system pressure increases, the switch is activated to complete the circuit to the burner. When pressure falls the switch plunger returns to its normal position.
190°F Max
Activates at 580 PSI
3 Wire switch
15 amp
The electrical portion of the switch is wired with three leads. Two leads are used , depending upon whether the switch is intended to be normally on or normally off operation. When used as a fluid system control, the switch will generally be installed in the normally closed configuration. When used as a boiler control, the switch may be installed in the normally open position.

Bimetallic thermostat that relies on the difference in rates of expansion and contraction by various types of metals when they are exposed to temperature changes. The sensor is made of two types of dissimilar metal bonded to each other. When the temperature changes, the two strips expand at different rates. The sensor bends in the direction of the strip which expands the slowest.
The thermostat is set by moving a contact either closer or farther from the me-metallic strip. The further the strip has to move to touch the contact, the greater the temperature change before the switch is activated.
NOTE: THE THERMOSTAT WILL RESET ONLY WHEN ALL MATERIAL SURROUNDING IT COOLS OFF. THE TEMPERATURE DROP COULD BE AS MUCH AS 50 DEGREES BEFORE RESETTING.
Positive in line bimeteal control
3000 PSI maximum @ 325 degrees F.
Universal 1/4 spade terminal connector
Adjustable temeprature

The Cam (Rotary) switch is used on pressure washers to control the operation of the electric pump motor and/or the burner motor.
Single Pole
1-7/8" Four Screw Face Plate
Wiring Instructions: Line 1: wire to terminal #2 or #4, Pump: wire to terminal #1, Burner: wire to Terminal #3

15 amp
Ground Fault Circuit Interrupters are fast acting circuit breakers which sense small imbalances in the circuit caused by current leakage to the ground, and in a fraction of a second suts off the electricity.

The Cam (Rotary) switch is used on pressure washers to control the operation of the electric pump motor and/or the burner motor.
Wiring Instructions: Line 1: wire to terminal #L1, Line 2: wire to terminal #L2, Pump: wire to terminal #1 and #3, Burner: wire to terminal #2 and #4
3 Position Off-Pump-Burner
110 Volt Single Stack Switch
Single Pole
1-7/8" Single Hole Face Plate
20 Amp

The ST-5 is a "normally open" flow switch, designed to be mounted in a high pressure water line. Inside the housing is a floating magnet which is aligned parallel with a reed switch. When the water flow is initiated, ususally by pulling the spray gun trigger, the water flow forces the magnet to move forward. Once in the correct position, the magnet pulls the thin reeds together, closing the circuit and allowing electrical continuity. When water flow ceases, usually when the trigger is released, gravity returns the magnet to its original position. the reeds then pull apart and open the circuit, stopping electrical continuity.
Mounts further downstream in pumping system than traditional vacuum switches, therby minimizing potential leak points that can cause vacuum switches to close.
Vacuum switches use rubber diaphragms that often rupture and cause vacuum leaks to the pump
Flow switches operate at a variety of pressures
Flow switches eliminate the need to restrict water flow to the pump, thereby prolonging pump life
the reed switch is encased in a protective glass capsule with a sealed nitrogen atmosphere that eliminates exposure to corrosive cleaning chemicals
Mounting Position: Vertical only
Magnet Configuration: Free floting
Cord/Lead Length: 47 inches
WIRING INSTRUCTIONS: Lead #1 to Line/Power, Lead #2 to Load Yellow with green tracer to Ground
Reed Switch Adjustment: depending on the system flow, it is normal for the magnet position to vary. This variance may require adjustment of the reed switch upon initial installation, especially at lower flow rates. If the switch fails to close upon initial flow, simply loosen the adjustment screw and position switch so it properly opens/closes according to flow conditions.